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Submission type

Update of janusplot from 0.1.0 to 0.1.1. The current CRAN version is 0.1.0 (published 2026-04-28). This is a minor feature and performance release with no breaking change to the public API.

Summary of changes in 0.1.1

  • New engine = c("bam", "gam") argument selecting the mgcv fitting backend. The default changes from mgcv::gam to mgcv::bam for a 3-10x speed-up at janusplot's scale. This is the single non-byte-identical change: bam's fREML estimation differs from gam's REML by ~1-3% in effective degrees of freedom, so fitted values, the asymmetry index, and per-cell colour fills may shift slightly when a user upgrades. engine = "gam" reproduces 0.1.0 output verbatim; this is documented prominently at the top of NEWS.md.
  • Per-cell k-checking, scale-aware compact rendering, rendering-only axes modes, and figure-to-file output via save_as. All strictly additive.
  • Internal: shared scalar-argument validation centralised behind one helper; test coverage of argument validation extended.

Test environments

  • macOS 26 (Darwin 25) / Apple Silicon -- R 4.5.2 (local).
  • win-builder (R-devel and R-release) -- to be re-run immediately before submission.
  • R-hub v2 (rhub::rhub_check(), default platforms) -- to be re-run immediately before submission.

R CMD check results

Local R CMD check --as-cran on the built janusplot_0.1.1.tar.gz: 0 ERRORs, 0 WARNINGs, 2 NOTEs. Both NOTEs are local-environmental and are not expected on the CRAN check farm, win-builder, or R-hub.

NOTE -- future file timestamps (local only)

checking for future file timestamps ... unable to verify current time is raised on the local check host, which cannot reach a time service.

NOTE -- HTML manual validation skipped (local only)

checking HTML version of manual ... Skipping checking HTML validation: 'tidy' doesn't look like recent enough HTML Tidy reflects the dated tidy shipped with the local macOS host; the CRAN farm and win-builder carry a recent HTML Tidy and do not raise it.

Downstream dependencies

There are 0 reverse dependencies on CRAN (checked against the current CRAN package database on 2026-06-26: zero reverse Depends / Imports / LinkingTo, and zero reverse Suggests). The default-engine change therefore has no reverse- dependency impact.

Package scope

janusplot renders pairwise asymmetric smoothed-association matrices of continuous variables via mgcv GAM fits. Each off-diagonal cell displays a directional smooth; the package exposes per-pair shape descriptors (monotonicity, convexity, inflection counts, a 24-category shape taxonomy) plus a recovery-rate sensitivity study (janusplot_shape_sensitivity()) with precomputed demo data.

Notes to the maintainers

  • All examples are executable without \dontrun{}; the heavier demonstrations sit under \donttest{}.
  • All tests run under testthat edition 3; visual output is regression-tested with vdiffr and skips cleanly where the snapshot back-end is unavailable.
  • No compiled code; pure R with Imports: from mgcv, ggplot2, patchwork, grid, stats, cli, lifecycle, rlang.
  • Source tarball is ~2 MB, including the precomputed shape_sensitivity_demo dataset.